Posted by **Rachel** on Thursday, October 28, 2010 at 11:56pm.

What force is required to accelerate a 90kg bike to 20 m/s in 15 sec?

I need to know HOW to do it!

- physics -
**jai**, Friday, October 29, 2010 at 12:05am
first, recall formula for Force:

F = ma

where m = mass in kg, and a = acceleration in m/(s^2)

then also recall the formula for acceleration,,

acceleration is change in velocity over time, thus:

a = (v - v0)/t

where v = final velocity in m/s

v0 = initial velocity in m/s

t = time in s

since you are you are given velocity and time, calculate for a first,, assuming the bike is initially at rest, v0 = 0:

a = (v - v0)/t

a = 20/15 = ? *solve this*

after that, substitute this to

F = ma

since you are also given the mass, you can solve for F.

hope this helps.

- physics -
**Rachel**, Friday, October 29, 2010 at 12:13am
thanks

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